I've been doing several experiments on the matter and read a lot, but to make 
sure II got it right, I would be grateful if I had your input.

So...

What is the difference between:

  * a = b
  * shallowCopy(a,b)
  * deepCopy(a,b)



when:

  * a/b are objects
  * a/b are ref objects
  * a/b are strings or sequences
  * a/b is everything else (int - for example)


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